package com.heima.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.search.dtos.UserSearchDto;
import com.heima.search.service.ApUserSearchService;
import com.heima.search.service.ArticleSearchService;
import com.heima.utils.thread.ApUserThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author 陈辉
 * @data 2023 11:35
 */
@Slf4j
@Service
public class ArticleSearchServiceImpl implements ArticleSearchService {
    @Autowired
    private RestHighLevelClient restHighLevelClient;
    @Autowired
    private ApUserSearchService apUserSearchService;
    /**
     * ES文章分页搜索
     * @param dto
     * @return
     */
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {
        //1.检查参数
        if(dto == null || StringUtils.isBlank(dto.getSearchWords())){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        //2.1 设置布尔查询条件
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //关键字的分词之后查询
        MultiMatchQueryBuilder multiMatchQueryBuilder = QueryBuilders.multiMatchQuery(dto.getSearchWords(), "title", "content");
        boolQueryBuilder.must(multiMatchQueryBuilder);
        //查询小于mindate的数据
        boolQueryBuilder.filter(QueryBuilders.rangeQuery("publishTime").lt(dto.getMinBehotTime().getTime()));
        searchRequest.source().query(boolQueryBuilder);

        //2.2 设置分页查询
        searchRequest.source().from(0);
        searchRequest.source().size(dto.getPageSize());

        //2.3 按照发布时间倒序查询
        searchRequest.source().sort("publishTime", SortOrder.DESC);

        //2.4 设置高亮  title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        highlightBuilder.field("title");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        searchRequest.source().highlighter(highlightBuilder);
        //2.5 发送请求，查询ES
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //3.结果封装返回
        List<Map> list = new ArrayList<>();

        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            //处理高亮
            if(hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0){
                Text[] titles = hit.getHighlightFields().get("title").getFragments();
                String title = StringUtils.join(titles);
                //高亮标题
                map.put("h_title",title);
            }else {
                //原始标题
                map.put("h_title",map.get("title"));
            }
            list.add(map);
        }

        //异步调用保存搜索历史记录的功能
        //只有当前登录用户不为空并且用户在首页搜索，才进行历史记录的保存
        if (ApUserThreadLocalUtil.get()!= null && dto.getFromIndex() == 0) {
            apUserSearchService.insert(dto.getSearchWords(), ApUserThreadLocalUtil.get());
        }
        return ResponseResult.okResult(list);

    }
}
